<template>
  <div v-if="showFullScreenBtn" class="full-screen-btn-con">
    <Tooltip :content="value ? '退出全屏' : '全屏'" placement="bottom">
      <Icon
        :type="value ? 'md-contract' : 'md-expand'"
        :size="23"
        @click.native="handleChange"
      ></Icon>
    </Tooltip>
  </div>
</template>

<script>
export default {
  name: 'Fullscreen',
  props: {
    value: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    showFullScreenBtn() {
      return window.navigator.userAgent.indexOf('MSIE') < 0
    }
  },
  mounted() {
    let isFullscreen =
      document.fullscreenElement ||
      document.mozFullScreenElement ||
      document.webkitFullscreenElement ||
      document.fullScreen ||
      document.mozFullScreen ||
      document.webkitIsFullScreen
    isFullscreen = !!isFullscreen
    document.addEventListener('fullscreenchange', () => {
      this.$emit('input', !this.value)
      this.$emit('on-change', !this.value)
    })
    document.addEventListener('mozfullscreenchange', () => {
      this.$emit('input', !this.value)
      this.$emit('on-change', !this.value)
    })
    document.addEventListener('webkitfullscreenchange', () => {
      this.$emit('input', !this.value)
      this.$emit('on-change', !this.value)
    })
    document.addEventListener('msfullscreenchange', () => {
      this.$emit('input', !this.value)
      this.$emit('on-change', !this.value)
    })
    this.$emit('input', isFullscreen)
  },
  methods: {
    handleFullscreen() {
      const main = document.body
      if (this.value) {
        if (document.exitFullscreen) {
          document.exitFullscreen()
        } else if (document.mozCancelFullScreen) {
          document.mozCancelFullScreen()
        } else if (document.webkitCancelFullScreen) {
          document.webkitCancelFullScreen()
        } else if (document.msExitFullscreen) {
          document.msExitFullscreen()
        }
      } else if (main.requestFullscreen) {
        main.requestFullscreen()
      } else if (main.mozRequestFullScreen) {
        main.mozRequestFullScreen()
      } else if (main.webkitRequestFullScreen) {
        main.webkitRequestFullScreen()
      } else if (main.msRequestFullscreen) {
        main.msRequestFullscreen()
      }
    },
    handleChange() {
      this.handleFullscreen()
    }
  }
}
</script>

<style lang="less">
.full-screen-btn-con .ivu-tooltip-rel {
  height: 64px;
  line-height: 56px;
  i {
    cursor: pointer;
  }
}
</style>
